Basic Function Of Program Counter
Program status word:In computers, the program status word (PSW) is an area of memory or a hardware register which contains information about program state used by the operating system and the underlying hardware. It will normally include a pointer (address) to the next instruction to be executed. The program status word typically contains an error status field and condition codes such as the interrupt enable/disable bit and a supervisor/user mode bit.Program counter registersThe program counter (also called the instruction pointer, part of the instruction sequencer in some computers) is a register in acomputer processor which indicates where the computer is in its instruction sequence. Domino master gold game download. Depending on the details of the particular machine, it holds either the address of the instruction being executed, or the address of the next instruction to be executed. The program counter is automatically incremented for each instruction cycle so that instructions are normally retrieved sequentially from memory. Certain instructions, such as branches and subroutine calls and returns, interrupt the sequence by placing a new value in the program counter.